package com.cooper.android.comm;

import android.content.Context;
import android.graphics.Camera;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;

public class GalleryFlow extends Gallery {

	/**
	 * Graphics Camera used for transforming the matrix of ImageViews
	 */
	private Camera mCamera = new Camera();

	/**
	 * The maximum angle the Child ImageView will be rotated by
	 */
	private int mMaxRotationAngle = 45;

	/**
	 * The maximum zoom on the centre Child
	 */
	private int mMaxZoom = -120;

	/**
	 * The Centre of the Coverflow
	 */
	private int mCoveflowCenter;

	public GalleryFlow(Context context) {
		super(context);
		init();
	}

	public GalleryFlow(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	private void init() {
		this.setStaticTransformationsEnabled(true);
	}

	/**
	 * Get the max rotational angle of the image
	 * 
	 * @return the mMaxRotationAngle
	 */
	public int getMaxRotationAngle() {
		return mMaxRotationAngle;
	}

	/**
	 * Set the max rotational angle of each image
	 * 
	 * @param maxRotationAngle
	 *            the mMaxRotationAngle to set
	 */
	public void setMaxRotationAngle(int maxRotationAngle) {
		mMaxRotationAngle = maxRotationAngle;
	}

	/**
	 * Get the Max zoom of the centre image
	 * 
	 * @return the mMaxZoom
	 */
	public int getMaxZoom() {
		return mMaxZoom;
	}

	/**
	 * Set the max zoom of the centre image
	 * 
	 * @param maxZoom
	 *            the mMaxZoom to set
	 */
	public void setMaxZoom(int maxZoom) {
		mMaxZoom = maxZoom;
	}

	/**
	 * Get the Centre of the Coverflow
	 * 
	 * @return The centre of this Coverflow.
	 */
	private int getCenterOfCoverflow() {
		return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
				+ getPaddingLeft();
	}

	/**
	 * Get the Centre of the View
	 * 
	 * @return The centre of the given view.
	 */
	private static int getCenterOfView(View view) {
		return view.getLeft() + view.getWidth() / 2;
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see #setStaticTransformationsEnabled(boolean)
	 */
	protected boolean getChildStaticTransformation(View child, Transformation t) {

		final int childCenter = getCenterOfView(child);
		final int childWidth = child.getWidth();
		int rotationAngle = 0;

		t.clear();
		t.setTransformationType(Transformation.TYPE_MATRIX);

		if (childCenter == mCoveflowCenter) {
			transformImageBitmap(child, t, 0);
		} else {
			rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
			if (Math.abs(rotationAngle) > mMaxRotationAngle) {
				rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle
						: mMaxRotationAngle;
			}
			transformImageBitmap(child, t, rotationAngle);		
		}

		return true;
	}

	/**
	 * This is called during layout when the size of this view has changed. If
	 * you were just added to the view hierarchy, you're called with the old
	 * values of 0.
	 * 
	 * @param w
	 *            Current width of this view.
	 * @param h
	 *            Current height of this view.
	 * @param oldw
	 *            Old width of this view.
	 * @param oldh
	 *            Old height of this view.
	 */
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		mCoveflowCenter = getCenterOfCoverflow();
		super.onSizeChanged(w, h, oldw, oldh);
	}

	/**
	 * Transform the Image Bitmap by the Angle passed
	 * 
	 * @param imageView
	 *            ImageView the ImageView whose bitmap we want to rotate
	 * @param t
	 *            transformation
	 * @param rotationAngle
	 *            the Angle by which to rotate the Bitmap
	 */
	private void transformImageBitmap(View child, Transformation t,
			int rotationAngle) {
		mCamera.save();
		final Matrix imageMatrix = t.getMatrix();
		final int imageHeight = child.getHeight(); // child.getLayoutParams().height;
		final int imageWidth = child.getWidth();// child.getLayoutParams().width;
		final int rotation = Math.abs(rotationAngle);

		// 在Z轴上正向移动camera的视角，实际效果为放大图片。
		// 如果在Y轴上移动，则图片上下移动；X轴上对应图片左右移动。
		mCamera.translate(0.0f, 0.0f, 100.0f);

		// As the angle of the view gets less, zoom in
		if (rotation < mMaxRotationAngle) {
			float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));
			mCamera.translate(0.0f, 0.0f, zoomAmount);
		}

		// 在Y轴上旋转，对应图片竖向向里翻转。
		// 如果在X轴上旋转，则对应图片横向向里翻转。
		mCamera.rotateY(rotationAngle);
		mCamera.getMatrix(imageMatrix);
		imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
		imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
		mCamera.restore();
	}

	@Override
	public void onDraw(Canvas canvas) {
/*
		Bitmap backBmp = Bitmap.createBitmap(getWidth() / 2, getHeight() / 2, Config.ARGB_8888);
		Canvas shaderCanvas = new Canvas(backBmp);
		shaderCanvas.save();
		Paint paint = new Paint();
		paint.setAntiAlias(true);
		paint.setShader(new SweepGradient(0, 0, new int[] {
				Color.rgb(68, 68, 68), Color.rgb(181, 182, 181),
				Color.rgb(68, 68, 68), Color.rgb(181, 182, 181), }, null));
		shaderCanvas.drawRect(0, 0, getWidth() / 2, getHeight() / 2, paint);		
		shaderCanvas.restore();

		canvas.save();
	
		//RadialGradient radialGradient =new RadialGradient(0, getHeight() / 2, getWidth() /2,
		//		new int[] { Color.rgb(8, 12, 8), Color.rgb(181, 182, 181),
		//				Color.rgb(116, 160, 160) }, null,Shader.TileMode.MIRROR);
		
		//SweepGradient sweepGradient = new SweepGradient(0, getHeight() / 2, new int[] {
		//	Color.rgb(68, 68, 68), Color.WHITE}, null);
		//Shader mBitmapShader = new BitmapShader(backBmp,Shader.TileMode.REPEAT,Shader.TileMode.REPEAT);
		
		//ComposeShader shader =new ComposeShader(sweepGradient,radialGradient,PorterDuff.Mode.MULTIPLY);
		
		Paint paint = new Paint();
		paint.setAntiAlias(true);
		paint.setShader(new RadialGradient(0, getHeight() / 3, getWidth() /2,
				new int[] { Color.rgb(8, 12, 8), Color.rgb(181, 182, 181),
			Color.rgb(116, 160, 160) }, null,Shader.TileMode.MIRROR));
		canvas.drawRect(0, getHeight() / 2, getWidth()/2 , getHeight(), paint);
		canvas.save();
		canvas.restore();
		paint.setShader(new RadialGradient(getWidth(), getHeight() / 3, getWidth() /2,
				new int[] { Color.rgb(8, 12, 8), Color.rgb(181, 182, 181),
			Color.rgb(116, 160, 160) }, null,Shader.TileMode.MIRROR));		
		canvas.drawRect(getWidth() /2, getHeight() / 2, getWidth() , getHeight(), paint);
		canvas.restore();
		/*
		paint.setAntiAlias(true);
		paint.setShader(new SweepGradient(0, getHeight() / 2, new int[] {
				Color.rgb(68, 68, 68), Color.rgb(181, 182, 181),
				Color.rgb(68, 68, 68), Color.rgb(181, 182, 181), }, null));
		canvas.drawRect(0, getHeight() / 2, getWidth() / 2, getHeight(), paint);
		canvas.restore();
		
		canvas.save();
		paint.setShader();
		canvas.drawRect(getWidth() / 2, getHeight() / 2, getWidth(),
				getHeight(), paint);
		canvas.restore(); */
		// canvas.save();
		// paint.setShader(new LinearGradient(0, 0, 0, 2, new int[] {
		// Color.BLACK,
		// Color.LTGRAY }, null, Shader.TileMode.MIRROR));
		// canvas.drawRect(0, getHeight() / 2 - 4, getWidth(), getHeight() / 2,
		// paint);
		// canvas.restore();
		// paint.setShader(new RadialGradient(0, 0, getWidth() / 4, new int[] {
		// Color.BLACK, Color.LTGRAY }, null,Shader.TileMode.CLAMP));
		// paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
		// canvas.translate(0, 0);
		// canvas.drawRect(0, getHeight() / 2,getWidth() / 4,getHeight(),paint);
		// canvas.restore();
		// canvas.save();
		// paint.setShader(new RadialGradient(0, 0, getWidth() / 2, new int[] {
		// Color.BLACK, Color.rgb(116, 160, 160) }, null,
		// Shader.TileMode.MIRROR));
		// canvas.drawRect(getWidth() / 4, getHeight() / 2, getWidth() * 3 / 4,
		// getHeight(), paint);
		// canvas.restore();
		super.onDraw(canvas);

	}

}
